SN 2024bch: Upper limits from a neutrino search with IceCube
ATel #16443; Angela Zegarelli (Ruhr-University Bochum), Jessie Thwaites (University of Wisconsin - Madison), Anna Franckowiak (Ruhr-University Bochum), Erik Blaufuss (University of Maryland), Marcos Santander (University of Alabama - Tuscaloosa), Justin Vandenbroucke (University of Wisconsin - Madison)
on 13 Feb 2024; 23:38 UT
Credential Certification: Justin Vandenbroucke (justin.vandenbroucke@wisc.edu)
Subjects: Neutrinos, Supernovae
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
IceCube has performed a search for track-like muon neutrino events arriving from the direction of the nearby Type IIn supernova SN 2024bch (https://www.wis-tns.org/object/2024bch) over two time windows in order to detect emission from either the shock propagation wave inside the stellar progenitor up to the shock breakout or the interaction of the ejecta with the circumstellar medium. The first window covers the time range between T0 - 8.5 days and T0, with T0 being the earliest optical detection time as reported by GOTO (2024-01-20 13:18:42.6 to 2024-01-29 01:18:42.6), during which time IceCube was recording good quality data. In this case, we report a p-value of 1.0, consistent with background expectation. We accordingly derive a time-integrated muon-neutrino flux upper limit for this source of E^2 dN/dE = 6.9 x 10^-2 GeV cm^-2 at 90% CL, under the assumption of an E^-2 power law. 90% of events IceCube would detect from a source at this declination with an E^-2 spectrum have energies in the approximate energy range between 600 GeV and 220 TeV.
The second search was performed in a time range of T0 to T0 + 2 weeks (2024-01-29 01:18:42.6 to 2024-02-12 01:18:42.6), during which time IceCube was recording good quality data. In this case, we report a p-value of 0.13, also consistent with background expectation. We accordingly derive a time-integrated muon-neutrino flux upper limit for this source of E^2 dN/ dE = 7.6 x 10^-2 GeV cm^-2 at 90% CL, under the assumption of an E^-2 power law.
The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu.
[1] IceCube Collaboration, R. Abbasi et al., ApJ 910 4 (2021)
